* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 40px 20px;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 10px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
}

.instructions {
    background: #e3f2fd;
    border-left: 4px solid #2196F3;
    padding: 15px;
    margin-bottom: 30px;
    border-radius: 4px;
}

.instructions h3 {
    color: #1565c0;
    margin-bottom: 10px;
}

.instructions ol {
    margin-left: 20px;
    color: #333;
}

.instructions li {
    margin: 8px 0;
    font-size: 0.95rem;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

input {
    flex: 1;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    padding: 12px 20px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.btn:hover {
    background: #764ba2;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
    margin-left: 5px;
}

.btn-delete {
    background: #f44336;
}

.btn-delete:hover {
    background: #d32f2f;
}

.btn-complete {
    background: #4caf50;
}

.btn-complete:hover {
    background: #388e3c;
}

.todos-container {
    margin-top: 30px;
}

.todo-item {
    background: #f9f9f9;
    border-left: 4px solid #667eea;
    padding: 15px;
    margin-bottom: 12px;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s;
}

.todo-item:hover {
    background: #f5f5f5;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.todo-item.completed {
    opacity: 0.6;
    border-left-color: #4caf50;
}

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: #999;
}

.todo-content {
    flex: 1;
}

.todo-text {
    color: #333;
    font-size: 1rem;
    margin-bottom: 5px;
}

.todo-id {
    color: #999;
    font-size: 0.85rem;
}

.todo-actions {
    display: flex;
    gap: 5px;
}

.error {
    background: #ffebee;
    border-left: 4px solid #f44336;
    color: #c62828;
    padding: 15px;
    border-radius: 4px;
    margin-top: 20px;
}

.success {
    background: #e8f5e9;
    border-left: 4px solid #4caf50;
    color: #2e7d32;
    padding: 15px;
    border-radius: 4px;
    margin-top: 20px;
}

.empty {
    text-align: center;
    color: #999;
    padding: 40px 20px;
}

.loading {
    display: none;
    text-align: center;
    color: #667eea;
    margin: 20px 0;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.back-button {
    display: inline-block;
    margin-top: 30px;
    padding: 10px 20px;
    background: #999;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s;
}

.back-button:hover {
    background: #777;
}

code {
    background: #f5f5f5;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    color: #d63384;
}

.counter {
    background: #667eea;
    color: white;
    padding: 8px 12px;
    border-radius: 20px;
    display: inline-block;
    font-size: 0.9rem;
    margin-top: 10px;
}

.search-section {
    background: #f0f4ff;
    border: 2px solid #667eea;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.search-section h3 {
    color: #667eea;
    margin-bottom: 15px;
}

.search-container {
    position: relative;
    margin-bottom: 10px;
}

#userSearch {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

#userSearch:focus {
    outline: none;
    border-color: #667eea;
}

.suggestions {
    background: white;
    border: 1px solid #ddd;
    border-top: none;
    border-radius: 0 0 4px 4px;
    max-height: 250px;
    overflow-y: auto;
    display: none;
}

.suggestions:not(:empty) {
    display: block;
}

.suggestion-item {
    padding: 12px;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 0.95rem;
}

.suggestion-item:hover {
    background: #f0f4ff;
    color: #667eea;
}

.suggestion-item:last-child {
    border-bottom: none;
}

.selected-user {
    color: #666;
    font-size: 0.95rem;
    padding: 10px 0;
}